A single cylinder vertical engine has a bore of \(250 \mathrm{~mm}\) and a stroke of \(500 \mathrm{~mm}\). The connecting rod is \(1000 \mathrm{~mm}\) long. The mass of the reciprocating parts is \(150 \mathrm{~kg}\). The gas pressure is \(0.75 \mathrm{MPa}\) during expansion stroke when the crank is at \(30^{\circ}\) form TDC. The speed of the engine is \(240 \mathrm{rpm}\). Determine:

(a) net force acting on the piston,

(b) resultant load on the gudgeon pin,

(c) thrust on the cylinder walls, and

(d) the speed above which, other things remaining same, the gudgeon pin load would be reversed in direction.